Single molecular motors

ORGN 251

Paul S. Weiss, stm@psu.edu1, Tomohide Takami, takami@visionarts.co.jp2, Tao Ye, tuy1@psu.edu1, Ken ichi Sugiura3, Dennis P. Arnold4, Jianzhuang Jiang5, and James M. Tour, tour@rice.edu6. (1) Departments of Chemistry and Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, PA 16802, (2) Visionarts Research, Inc, 104 Davey Laboratory, University Park, PA 16802, (3) Department of Chemistry, Tokyo Metropolitan University, (4) School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Australia, (5) Department of Chemistry, Shandong University, Jinan, China, (6) Department of Chemistry and Center for Nanoscale Science and Technology, Rice University, MS 222, 6100 Main Street, Houston, TX 77005
We explore three families of synthetic molecular motors. One family is based on caltrops, one family is based on sandwich porphyrins, and the third is based on hybrid porphyrins. Each is surface bound and presents challenges in terms of attachment and operation. Operation will be driven with external electric fields. Measurements will initially be performed using high frequency tunable AC scanning tunneling microscopy, which should enable operation and measurement well above the lowest rotational levels of the molecules. We demonstrate placement of both isolated and ordered layers of oriented molecules on surfaces. We use electrochemical potential as well as specific chemical attachment to control motor function. We also demonstrate a photoswitchable "lock" that can be incorporated into the design of the molecules. Through synthetic chemistry and self-assembly, we can design and specify the interactions of neighboring and patterned motors.
 

Molecular Rotors: Ethane, Gyroscopes, Arrays, and Beyond
1:30 PM-5:00 PM, Monday, 29 August 2005 Washington DC Convention Center -- Ballroom B, Oral

Division of Organic Chemistry

The 230th ACS National Meeting, in Washington, DC, Aug 28-Sept 1, 2005